Deprecate Packngo

[displague]

Drive Metal Go to the level where we can safely deprecate packngo and promote metal-go.

Related:

• Equinix Metal Go bindings equinixmetal-archive/packngo#213
• Take a serious look at generating this client from Swagger equinixmetal-archive/packngo#215

Integrations that have converted from packngo to metal-go are the best way to help developers adapt their projects. Implementation examples include:

• Adopt metal-go equinix/metal-cli#333
• feat: use metal-go for device reads (data source and resource) equinix/terraform-provider-equinix#291
• packngo is deprecated. Use equinix-sdk-go equinix/terraform-provider-equinix#402
• 🏃 Adopt metal-go kubernetes-sigs/cluster-api-provider-packet#527
• Replace packngo with metal-go kubernetes-sigs/cloud-provider-equinix-metal#439
• Adopt Metal Go metal-sweeper-action#12
• Migrate to equinix-sdk-go equinix/docker-machine-driver-metal#77

Should be done with #175.

[ctreatma]

This repo has been replaced by equinix/equinix-sdk-go. The remaining work to transition terraform-provider-equinix from packngo to equinix-sdk-go is being tracked in that repository. The packngo SDK has been deprecated and the repo is archived.